File formats
STL is the universal standard. Every slicer and printer reads it. If you have a choice, export as binary STL (smaller files, faster loading).
3MF is a newer format that stores color, material, and scale data. Some slicers prefer it for multi-material prints.
OBJ includes UV texture data but is rarely needed for single-color architectural models.
GLB/GLTF is designed for on-screen viewing, not printing. Convert to STL before sending to a printer.
Wall thickness
The most critical factor for architectural models. Real-world walls scale down to very thin dimensions:
| Real wall | At 1:100 | At 1:200 |
|---|---|---|
| 20 cm | 2.0 mm | 1.0 mm |
| 15 cm | 1.5 mm | 0.75 mm |
| 10 cm | 1.0 mm | 0.5 mm |
FDM minimum: 0.8mm (one nozzle width on a 0.4mm nozzle with two passes).
Resin minimum: 0.5mm.
Walls below these minimums will either skip entirely or print too fragile to survive removal from the bed.
Orientation
Print architectural models upright (floor on the bed, walls vertical). This:
- Puts layer lines horizontal along walls (strongest direction)
- Minimizes overhangs on wall surfaces
- Creates a flat base for bed adhesion
Support structures
Architectural models typically need supports for:
- Window openings (the lintel above each window)
- Doorway headers
- Any overhang greater than 45 degrees
Tree supports (available in Cura, PrusaSlicer) work best for house models — they use less material and leave cleaner contact surfaces than grid supports.
Mesh integrity
A printable mesh must be:
- Watertight — no holes or gaps in the surface
- Manifold — every edge shared by exactly two faces
- Consistently oriented — all face normals pointing outward
Common issues: non-manifold edges, inverted normals, zero-thickness faces. Most slicers can auto-repair minor issues. For serious problems, use Meshmixer or Microsoft 3D Builder.
The automated approach
Manual mesh preparation requires 3D modeling knowledge and is the biggest barrier for non-technical users.
Ritn3D eliminates this entirely. Upload a floor plan, generate a 3D model, and export a print-ready STL with:
- Automatic wall thickening to printable minimums
- Proper boolean-cut door and window openings
- Manifold-correct, watertight mesh geometry
- Pre-scaled to your chosen model size
No CAD software, no mesh repair, no manual preparation. Try it free.